Evaluation of plant growth promoting actinomycetes on chickpea (Cicer arietinum L.)
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Date
2019
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CCSHAU
Abstract
Chickpea is the second most important cold season food legume grown globally on a very
wide area. However, global yields of chickpea have been relatively stagnant for the last two decades
due to unpredictable climatic changes, incidence of diseases and extensive application of chemical
fertilizers and pesticides. Actinomycetes are one of the major components of rhizosphere microbial
population and are useful in soil nutrient cycling as well as plant growth-promotion. Since last few
years, studies on beneficial traits of actinomycetes regarding plant growth promotion and biocontrol
activities had opened new avenues for their applications in sustainable agriculture.
In the present investigation, total 40 (AK1-AK40) actinomycete isolates were retrieved from
different soil samples and chickpea nodules collected from CCS Haryana Agricultural University,
Hisar farms. All the isolates were assessed for different plant growth promoting traits including IAA
production, P solubilization (P-SI), Zn solubilization (Zn-SI), siderophore production, HCN
production, salt tolerance, biocontrol potential against F. oxysporum, ACC utilization and ammonia
excretion. Based on the results of various PGP traits, isolate AK3 with high P-SI (2.78) and Zn-SI
(3.92); AK6 with high HCN production; AK11 with good P-SI (2.70) and Zn-SI (3.27) and AK34 with
high IAA production (20.95μg ml-1) were evaluated for growth promotion of chickpea under pot
culture conditions. Isolate AK3 found promising in terms of nodulation, growth and yield parameters
under pot culture conditions was evaluated on chickpea variety HC-5 under field conditions (during
2017-2018). Coinoculation of AK3 along with Mesorhizobium 1233 was beneficial for plant growth
and yield of chickpea. The promising actinomycete isolate AK3, identified as Streptomyces
griseoruber on the basis of partial 16S rDNA sequencing, can be further tested on different locations
for use as biofertilizer.
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